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在计算有关运动的问题时,参照物选择得巧妙,会使问题简单化,使看似很难的问题迎刃而解.例1甲、乙两车行驶在东西方向的同一平直公路上,甲车以8m/s的速度匀速向东行驶,乙车以5m/s的速度匀速向西行驶.(1)若以甲车为参照物,乙车向哪个方向运动?速度为多大?(2)若以乙车为参照物,甲车向哪个方向运动?速度为多大?分析:(1)以甲车为参照物,就是把甲车当作是静止不动的,则乙车
When calculating the problems related to sports, the clever selection of reference objects will make the problem simple and make the seemingly difficult problems solved. Example 1 The two vehicles A and B travel on the same straight highway in the east-west direction. The speed of 8m/s travels to the east at a uniform speed, and the second car travels at a uniform speed of 5m/s to the west. (1) If a car is used as a reference, which direction does the car move in? What is the speed? (2) If The second car is the reference object. Which direction does the A car move in? How much is the speed? Analysis: (1) Take the A car as the reference object, that is, if the A car is stationary, then the B car